A Syndet Bar (also known as a Solid Shampoo Bar) is a blend of ingredients that gives you a shampoo in dry form. It has surfactants that will pull the dirt and grease from your hair and cleans it. If you want to learn how to make a shampoo bar like Lush? You have come to the right place. Syndet bars have gained popularity because you do not need any plastic packaging and they are easy to travel with.